The S&P 500 has turned a nervous spring into an eight-week winning streak, and that changes the conversation for founders, venture funds and anyone waiting for the IPO window to open again.
The market did not need perfect conditions to rally. It needed enough evidence that the worst fears of the first quarter were too heavy. By Friday's close on May 22, the S&P 500 had posted its eighth straight weekly gain, its longest run since the nine-week streak that ended in December 2023, while the Dow finished at a record closing high and the Nasdaq stayed close to record territory.
That matters because public markets set the temperature for private markets. When the S&P 500 is grinding higher and technology shares are leading, late-stage investors have more room to defend stronger marks, bankers have an easier time testing IPO demand, and founders can begin to talk about exits without sounding detached from reality.
As Bloomberg reported during Friday's session, the AI-fueled rally had already put the benchmark on track for its eighth weekly gain, with announced stock buybacks and cash takeovers topping $1 trillion globally this year. That is not just a stock-market footnote. It tells you that corporate buyers and boards are acting like capital markets are open again, even while investors keep one eye on oil prices, tariffs and the Federal Reserve.
The strongest signal in this rally is not only that stocks are up. It is where the appetite has returned. Technology and AI-adjacent names have been among the main beneficiaries, helped by the market's willingness to look through the cost debate around data centers, chips and power infrastructure. Investors may still argue about whether the AI buildout is too expensive, but they are no longer treating every dollar of AI capex as a warning sign.
That is a shift from the mood earlier in the year, when tariff uncertainty and questions over infrastructure spending made growth stocks easier to sell. The rebound suggests investors are again willing to pay for companies tied to compute demand, cloud expansion, semiconductor supply chains and enterprise automation. Nvidia remains the cleanest symbol of that trade, but the implications spread much further, from power equipment to software companies promising productivity gains from AI.
For startups, this is where the public rally becomes practical. A late-stage AI infrastructure company does not price itself in isolation. Its valuation is pulled by public comps, revenue multiples, acquisition activity and the willingness of growth investors to underwrite future demand. When public AI leaders are strong, private investors have more confidence that there will be buyers on the other side.
Warsh gives investors a new Fed story
The other question is whether the rally is also pricing in a friendlier policy backdrop under Kevin Warsh, who was confirmed as Federal Reserve chair on May 13 and, according to Schwab's market update, was set to be sworn in on May 22. Markets like a clear story, and a leadership transition at the Fed gives investors a fresh one to trade around.
That does not mean Warsh has suddenly promised easy money. The more realistic view is that investors are trying to price a steadier second half: less confusion from the Fed, less panic around inflation shocks, and a path where rate expectations do not keep punishing long-duration growth assets. The market can move a long way on that kind of relief before the policy evidence fully arrives.
There is risk in that. If inflation proves sticky or tariffs push costs higher, the Fed may have less freedom than equity investors want. A rally that depends on lower volatility can become fragile when the data turns against it. But for now, investors are behaving as if the policy backdrop is no longer a reason to hide.
The IPO window is not wide open yet
The exit market still has to prove itself. A stronger S&P 500 does not automatically mean every venture-backed company can go public at a 2021-style valuation. Public investors are more selective now, and they want clean growth, credible margins and a believable path to cash generation. The companies that can show those traits will benefit first.
Still, the tone has changed. Venture funds heading into the second half of 2026 can point to a better public-market tape when speaking with limited partners. That matters for deployment pace. LPs tend to become more patient when marks are rising and exit optionality improves, because the denominator pressure and liquidity anxiety that weighed on portfolios earlier in the cycle become easier to manage.
Founders should not mistake the rally for a blank check. The better lesson is that timing is becoming less hostile. Companies that delayed financing, M&A talks or IPO preparation in the first quarter now have a stronger reason to revisit those plans. The public market is saying risk is acceptable again, but it is still asking for discipline.
The next test is whether this rally can survive actual policy signals from Warsh, the next round of inflation data and another earnings cycle from AI leaders. If it can, the second half of 2026 may give founders and investors something they have not had in a while: a credible path from private growth to public liquidity.
Also read: Blue Origin is turning Florida into a launch capacity bet • Stellantis is pushing deeper into Qualcomm's automotive software stack • The US is keeping chip tariffs on the table.
